package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面类，实现公共字段填充处理
 *
 */
@Aspect
@Slf4j
@Component
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {

    }

    /**
     * 前置通知，在目标方法执行前执行
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint  joinPoint) {
        log.info("开始进行公共字段自动填充");

        //获取到当前拦截到的方法在数据库上的操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();//获得数据库操作类型

        //获得到当前拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }

        Object entity = args[0];

        //准备赋值的数据
        Long currentId = BaseContext.getCurrentId();
        LocalDateTime now = LocalDateTime.now();

        //根据数据库操作类型，为对应的实体对象赋值
        if (operationType == OperationType.INSERT) {
            try {
                Method createTimeMethod = entity.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
                Method updateTimeMethod = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method updateUserMethod = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                Method createUserMethod = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);

                //通过反射为对象属性赋值
                createTimeMethod.invoke(entity, now);
                updateTimeMethod.invoke(entity, now);
                updateUserMethod.invoke(entity, currentId);
                createUserMethod.invoke(entity, currentId);
                log.info("公共字段填充完成");
            } catch (Exception e) {
                e.printStackTrace();
            }
            }else if (operationType == OperationType.UPDATE) {
            try {
                Method updateTimeMethod = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method updateUserMethod = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                updateTimeMethod.invoke(entity, now);
                updateUserMethod.invoke(entity, currentId);
            }catch(Exception e){
                e.printStackTrace();
            }
        }

        }
    }


